Reinforcing weapon or armor is a server sided!!! But there is a pattern on it.....
Reinforce 1-12 click right card
Reinforce 13 click left card
Reinforce 14-16 click right card
Reinforce 17 click left card
Reinforce 18-22 click right card
Reinforce 23 left card
Reinforce 24-26 click right card
Reinforce 27 left card
Reinforce 28-30 click right card

enjoy!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!